ornithine

[ awr-nuh-theen ]
/ ˈɔr nəˌθin /

noun Biochemistry.

an amino acid, H2N(CH2)3CH(NH2)COOH, obtained by the hydrolysis of arginine and occurring as an intermediate compound in the urea cycle of mammals.

Nearby words

  1. ornery,
  2. ornis,
  3. ornith-,
  4. ornith.,
  5. ornithic,
  6. ornithinuria,
  7. ornithischian,
  8. ornitho-,
  9. ornithodoros,
  10. ornithoid

Origin of ornithine

1880–85; ornith(uric acid), secreted by birds + -ine2

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019


British Dictionary definitions for ornithine

ornithine

/ (ˈɔːnɪˌθiːn) /

noun

an amino acid produced from arginine by hydrolysis: involved in the formation of urea in the liver; diaminopentanoic acid. Formula: NH 2 (CH 2) 3 CHNH 2 COOH

Word Origin for ornithine

C19: from ornithuric (acid) secreted in the urine of birds, from ornitho- + uric

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medicine definitions for ornithine

ornithine

[ ôrnə-thēn′ ]

n.

An amino acid formed by the hydrolysis of arginine and important in the formation of urea.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Science definitions for ornithine

ornithine

[ ôrnə-thēn′ ]

An amino acid not found in proteins, formed by hydrolyzing arginine and important in the formation of urea. Chemical formula: C5H12N2O2.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.